Water pump



Jane 9, 1942.

N. E. WAHLBERG 2,285,953 WATER BUMP Filed Oct. 31., 1958 2 Sheets-Sheet 1 INVENT OR. lV/LS [/P/K K441946506 BY I ATTORNEY.

June 1942- N. E. WAHLBERG 2,235,953

WATER PUMP Filed Oct. 31, 1938 2 Sheets-Sheet 5 a4 Hill 56 Fzlya INVENTOR. BY M45 [1?//( IVA/{1.155426 ATTORNEY.

Patented June 9, 1942 WATER PUMP Nils Erik Wahlberg, Kenosha, Wis., assignor to Nash-Kelvinator Corporation, Kenosha, Wis., a

corporation of Maryland Application October 31, 1938, Serial No. 237,854v

12 Claims.

This invention relates to cooling system for internal combustion engines and has particular reference to a pump.

Pumps for circulation of a cooling fluid, in the past have been constructed of a somewhat comv plicated body which is usually made up of two or more parts, such parts being machined at their abutting edges and bolted to one another with a gasket interposed so as, to make them watertight.

It is an object of the present invention to eliminate the need for these finishing operations and the use of the gasket which is interposed between the parts of the pump body.

It is a further object of the invention to simplify the construction of water pumps by constructing the body of one piece. and by reducing the number of finishing operations which are required.

An additional object of the invention is to provide a pump having a body portion formed of a single unitary casting for embracing an impeller which is adapted to force cooling liquid through the cooling passages of an internal combustion engine, a part of the engine exterior to which the pump is secured serving as a cut-cff for the pump impeller.

It is a still further object of the invention to reduce the expense of manufacturing pumps by providing an improved method of constructing and assembling pumps, particularly pumps for circulating cooling fluid through the cooling system of an internal combustion engine.

Further objects of the invention will appear hereinafter as the description proceeds and will be pointed out in connection with the attached claims.

For a more complete understanding of the invention, reference may be had to the. following description and to the accompanying drawings, wherein:

Figure 1 is a side elevational view of an internal combustion engine showing a cooling system in conjunction therewith and illustrating the water pump of the present invention as applied thereto;

Figure 2- is a vertical cross-sectional view through the water pump and a portion of the motor block and taken substantially upon a plane as indicated by the line 2-2 of Figures 1 and 4 and looking in the direction of the arrows;

Figure 3 is a. perspective view of the water p p;

Figure 4 is a sectional view through the pump body and inlet connection of the water pump;

Figure 5 is a sectional view taken upon a plane as indicated by the line 5-5 of Figure 4 and looking in the direction of the arrows;

Figure 6 is a sectional view taken substantially upon a plane as indicated by the line 6-6 of Figure 4 and looking inthe direction of the arrows;

Figure 7 is an end elevational view of the water pump as viewed from the front of the engine; and,

Figure 8 is a detailed view of the water pump blade prior to assembly.

Referring more particularly to the drawings, in which similar reference characters are employed to designate similar parts, and which are to be taken as exemplifying rather than as limiting the invention, the device of the present invention will be seen to be embodied in a pump for a cooling system which forms a part of an internal combustion engine t0, theoutline of which is shown in Figure 1.

Water or other cooling liquid may flow from the motor I0 through a flexible connection 12 to a radiator 14. After circulating through the radiator I4. where it is cooled by means of air drawn therethrough by a suitable fan N5, the water is returned to the motor for recirculation therethrough by a flexible conduit [8 which conducts the cooling liquid from the radiator outlet to the inlet 2!! of a water pump 22 of the impeller type. A shaft 24, which has a flexible connection 25 with the shaft 28 of a generator driven by means of pulleys 30 and 32. and a belt 34 from the crankshaft of the motor Ill, is employed to actuate the pump. Belt 34 also passes over a pulley 36 attached to the fan It for driving the same.

The pump body 22' will be seen to comprise a cup-shaped casting which is provided with a flange 38 extending entirely around the rim of the cup and having apertures 49 for bolting the flange 38 to the motor Ill. The inlet 20 'forms an integral portion of the pump body. The pump body is also provided with an apertured extension 42 through which the impeller shaft 24 is adapted to extend. The extension 42 is preferably located closer to the top of the pump body 22 than to the bottom so as to locate the shaft 24 off center toward the top of the casting 22 as shown in Figure 2. The inside of the extension 42 is provided with a portion 44 of reduced diameter which is approximately of the same diameter as the outside diameter of the shaft 24, a second portion 45 of slightly larger diameter than portion 44 and a third portion 48 which is tapped to receive a packing nut 59. Packing material 52 is received Within the extension and surrounding the shaft 24 and is forced into contact with the shaft by means of the chamfered inner end 54 of the packing nut 50.

The shaft 24 terminates in a slotted portion 54 in which is received an impeller blade provided with a notch 58 in one side for mating with the bottom of the notch 54 in the impeller shaft 24.

The drawings show two types of connections which may be effected between the blade 55 and the shaft 24, Figure 2 showing the blade and shaft as held together by a pin 58 which is insorted through apertures in the split portion of the shaft 24 and in the blade 56 and. has its ends turned over against the shaft to prevent withdrawal of the pin. In Figures 4 and 5 the connection between the shaft and blade will be seen to comprise a screw-threaded fastener iii] which extends through the apertures in one of the split portions-of the shaft and is threadedly engaged with the blade 55. This fastener 6 3 may be of the self-threading type and the blade 56 is in such a case unapertured as shown in Figure 8.

The method of assembling the impeller shaft and impeller with the pump body is to insert shaft 24 through the extension 42 with its slotted end Within the cup 62 formed by the body 22. With the shaft in this position, it is possible to insert the impeller 56 through the mouth of the cup 62 and slip it into place with the bottom of its slot 58 abutting the bottom of the slot 54 in the impeller shaft 24. It is then possible to insert the fastener 58 or the fastener 60 (according to which type is desired) by operating a tool through the open mouth of the cup 62. The packing 52 and packing nut 50 may then be inserted in the extension 42 and the nut 50 tightened to force the packing 52 against the shaft 24 to exclude the possibility of water or other cooling liquid leaking along the shaft 24 from the interior of the casting 22,

The inlet opens into the cup 62 at a point on the body 22 opposite the extension 42 through an opening 64 so that the incoming cooling liquid is discharged into the pump casing axially of the shaft 24.

The pump body is bolted to the motor Ii! by means of fasteners 66 which extend through the g apertures in the flange 38 and have threaded engagement with the motor block Ill. Lock washers 68 ma be inserted beneath the heads of the fasteners 66.

The motor block N! is provided with a finished face 10 against which the finished face of the flange 33 may be fitted with a gasket 12 interposed. An extension 14 of the motor block depends from the upper finished surface of the motor block to a point lying in approximately the same horizontal plane as the impeller shaft 2 4. The inner face of the extension M lies closely adjacent the path swept by the ends or extremities of the impeller blade as indicated by the dot-dash line of Figure 2 and serves as a cutoff for fluid being moved by the impeller blade 56, thus requiring such fluid to pass through the aperture 16 in the block it and into the water conducting passages 18 of said block.

Referring to Figure 4, it will be noted that the inlet 29 passes closely adjacent the bottom or well of the cup 62 with only a thin web of the pump body interposed. In order to prevent water standing within the pump body well 89 when the system is drained as for repairs or storage and the likelihood of such water freezing and causing damage to the impeller or to the shaft or both upon starting of the motor, a drain aperture 82 is provided extending through such web. It should be noted that the pump is connected to the lowermost passage in the cooling water jacket surrounding the motor and the pump therefor acts to supply water under pressure to the motor water jacket to insure an adequate suppl of cooling liquid to the motor at all times. Upon the upper end of the inlet 20 there is provided a pipe-threaded aperture 84 which is shown in the drawings as being closed by a plug 86. This aperture 86 is supplied to provide for the connection of a return or cold water line from a hot water heater with which the automobile in which the engine is located may be supplied. The outlet to such hot water heater will, of course, be located in the conduit !2 in the usual manner.

While the invention has been described with considerable particularity, such description is not to be taken as limiting the attached claims but merely as indicating the preferred embodiment of the invention. It is expressly to be understood and will be obvious to those skilled in the art that changes and modifications may be made without departing from the spirit and scope of the invention,

I claim:

1. In combination with an internal combustion engine, a pump for circulating fluid through the engine comprising a one-piece pump body having an impeller therein adapted to rotate to impel fluid through an open portion of the body against the exterior of said engine, and an aperture in the exterior of said engine offset toward and registering with only the pressure side of said impeller and restricting the open portion of the body,

2. In combination with an engine, a fluid pump of the impeller type comprising a. one-piece body having a cup-shaped pumping chamber open at one side only to provide an outlet, an impeller shaft extending into the pumping chambar at one end and having an impeller blade thereon for rotation within the pumping chamber, an inlet to the pumping chamber at the opposite end thereof and extending axially of said shaft, said body being secured to said engine, and an aperture in said engine registering with a portion only of said pump outlet, said aperture restricting the opening of the pump body.

3. In combination with an engine, a pump of the impeller type comprising a one-piece pump body having a pumping chamber, a shaftextending into said pumping chamber at one side thereof, a fluid inlet arranged at the opposite side and extending axially of said shaft into said pumping chamber, an outlet from said chamber arranged at right angles to said inlet, means forming a portion of the engine for blocking off a portion of said outlet to provide a cut-off.

4. A method of constructing a cooling fluid pump for an internal combustion engine which comprises, providing an integral pump body having an inlet and an outlet, said outlet being formed in a flat surface of said body and said body being hollow to provide an impeller casing having an opening therein for the introduction of an impeller shaft, inserting an impeller blade through the outlet, inserting an impeller shaft through said opening, securing said blade to said shaft within the pump body, packing the opening through which the shaft extends, securing the flat surface of said body to a flat surface on said engine, the flat surface on said engine being provided with an inlet aperture smaller in size than the outlet from said pump body, and registering the engine inlet with the pressure side of the pump body outlet so as to provide a cut-off.

5. A pump for circulating cooling fluid through an object having a flat wall defining an opening, said pump consisting of a shell having a rounded end and being open at the other end, a bushing formed on one side of said shell and off center of the rounded end of said shell, a shaft extending through said bushing and into said shell, an impeller fixed in situ to the end of said shaft within the shell after said shaft is extended through said bushing, a conduit defining an inlet opening axially aligned with said shaft and on the opposite side of said shell, said conduit being formed integrally with said shell, and means fastening said shell to said wall with the opening in said wall registering with the open side of said shell and offset from the axis of said shaft, said hole in said wall being smaller than the open side of said shell.

6. A pump comprising a one-piece pump body including a pumping chamber, a shaft opening extending through one side of said body into said chamber, a shaft extending through said opening and sealed against leakage, an impeller on said shaft and secured in situ within said body, an inlet opening extending through said body and into said chamber upon the side of said chamber opposite said shaft opening, an inlet connector extending from said inlet opening and along the wall of said pump body, said connector being integral with said pump body and having its interior wall formed by an exterior Wall of said body, and an outlet from said pump body formed in the wall thereof and arranged to pass the discharge from said pump.

'7. A one-piece pump body comprising a hollow, shell-like, pumping chamber, a boss extending from one side of said chamber and provided with an aperture extending therethrough into said chamber to receive an impeller shaft, an enlarged hollow rib arranged upon the opposite side of said chamber and serving as a conduit having interior walls formed in part by the exterior walls of said chamber, said conduit communicating with an inlet opening arranged in said chamber on the opposite side thereof to said shaft aperture and axially thereof, and an outlet from said chamber arranged at one end thereof between said inlet opening and said impeller shaft opening.

8. A pump comprising a one-piece casting having a boss thereon and defining inlet and outlet openings, a shaft extending into said casting through said boss and having a slot in the end thereof, a blade positioned in said slot, and means clamping said blade in said slot, said clamping means being accessible through one of said openings.

9. A pump comprising a one-piece casting having a hollow body with fiat sides and an opening on one edge, an intake duct cast integrally along one side and edge of said body and communicating with said body through the center thereof, a shaft extending through the other side of said body, a generally fiat blade in said body, and means for securing said blade in situ to said shaft.

10. A pump comprising a one-piece casting having a hollow body with flat sides and an opening on one edge, an intake duct cast integrally along one side and edge of said body and communicating with said body through the center thereof, a shaft extending through the other side of said body, a generally flat blade in said body, and means for securing said blade in situ to said -shaft, said securing means being accessible through the opening in the edge of said body.

11. A pump comprising an integral shell having an impeller rotatable therein, said shell surrounding said impeller on all sides except one defining an outlet, walls defining an inlet to said shell along one end and the bottom thereof and arranged to admit fiuid into said shell along the axis of the shell, said outlet being disposed at right angles to the axis of said shell and a portion of the lower wall of said shell defining a drain from said shell to said inlet.

12. A pump comprising an integral shell having an impeller rotatable therein, said shell surrounding said impeller on all sides except one defining an outlet, Walls integral with said shell defining an inlet arranged to admit fluid into said shell along the axis of rotation of said impeller, said outlet being disposed to discharge at right angles to the axis of said shell and impeller.

NILS ERIK WAHLBERG. 

